hardware sizing for a large mail installation?

[Adam Tauno WIlliams]

> > I'm looking for pointers (past experience in particular) for sizing a
> > mail server for a large-ish mail install based on postfix, cyrus,
> > amavisd-new, clamav, spamassassin, and web mail (most likely imp)
> > serving around 100k mailboxes.
> I'm out of my league in estimating the hardware side of things, 
> but on the webmail front I would seriously reconsider using HORDE/IMP. 

We've been serving Cyrus IMAPd to users for years using Horde/IMP; 
never had any problems.  The associated Turba address book is a
wonderfully flexible package.

---
Cyrus Home Page: http://asg.web.cmu.edu/cyrus
Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu
List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html